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Finance Receivables and Loans, Net (Allowance for Credit Losses on Financing Receivables) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Allowance, beginning balance $ 3,587 $ 3,711 $ 3,711  
Charge-offs (758) (601) (2,720)  
Recoveries 219 192    
Net charge-offs (539) (409)    
Write-downs from transfers to held-for-sale (5)      
Provision for credit losses 507 449    
Other   0    
Allowance, ending balance 3,550 3,751 3,587  
Unfunded Loan Commitment        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Provision for credit losses   (3)    
Consumer        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Charge-offs (757)   (2,590)  
Consumer | Automotive        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Allowance, beginning balance 3,083 3,020 3,020  
Charge-offs (688) (536) (2,284)  
Recoveries 211 185    
Net charge-offs (477) (351)    
Write-downs from transfers to held-for-sale (5)   (41)  
Provision for credit losses 449 353    
Other   0    
Allowance, ending balance 3,050 3,022 3,083  
Consumer | Consumer mortgage        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Allowance, beginning balance 21 27 27  
Charge-offs (1) (1) (3)  
Recoveries 1 2    
Net charge-offs 0 1    
Write-downs from transfers to held-for-sale 0      
Provision for credit losses 0 (4)    
Other   (1)    
Allowance, ending balance 21 23 21  
Consumer | Consumer other        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Allowance, beginning balance 293 426 426  
Charge-offs (68) (64) (303)  
Recoveries 6 5    
Net charge-offs (62) (59)    
Write-downs from transfers to held-for-sale 0   (174)  
Provision for credit losses 60 88    
Other   0    
Allowance, ending balance 291 455 293  
Fair value, option, carrying amount, financing receivable, no allowance   2   $ 3
Commercial        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Allowance, beginning balance 190 238 238  
Charge-offs (1) 0 (130)  
Recoveries 1 0    
Net charge-offs 0 0    
Write-downs from transfers to held-for-sale 0      
Provision for credit losses (2) 12    
Other   1    
Allowance, ending balance 188 $ 251 190  
Commercial | Automotive        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Charge-offs $ (1)   (24)  
Commercial | Consumer other        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Charge-offs     $ (106)